FreeCalypso > hg > freecalypso-reveng
changeset 19:2d9c927cc24b
boot ROM re: some better comments
| author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
|---|---|
| date | Thu, 25 Apr 2013 06:03:27 +0000 |
| parents | 123cb5021b64 |
| children | a52e76c12e6b |
| files | bootrom.disasm |
| diffstat | 1 files changed, 8 insertions(+), 2 deletions(-) [+] |
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--- a/bootrom.disasm Thu Apr 25 05:47:59 2013 +0000 +++ b/bootrom.disasm Thu Apr 25 06:03:27 2013 +0000 @@ -148,6 +148,7 @@ 1b8: eb000451 bl 0x1304 1bc: e8bd8000 ldmia sp!, {pc} case 7: +; apparently never exercised 1c0: e3a0c061 mov r12, #97 ; 0x61 'a' 1c4: e5c0c001 strb r12, [r0, #1] 1c8: e3a01002 mov r1, #2 ; 0x2 @@ -1814,6 +1815,9 @@ ; If the argument in R0 equals 1, a call to the 0xe2c memmap/clock init ; function is made first, with the same arguments as at the beginning ; of main(). +; +; Note that this routine is not called from anywhere in the boot ROM +; itself - but its address is listed in the CAL228 document. 1608: e92d4000 stmdb sp!, {lr} 160c: e24dd008 sub sp, sp, #8 ; 0x8 @@ -2074,5 +2078,7 @@ 1ff0: e51ff024 ldr pc, [pc, #-36] ; 0x1fd4 1ff4: e51ff024 ldr pc, [pc, #-36] ; 0x1fd8 1ff8: e51ff024 ldr pc, [pc, #-36] ; 0x1fdc -; ??? - 1ffc: 03000000 tsteq r0, #0 ; 0x0 +; CAL228 document identifies the last 16-bit word as the version number +; The version we've got appears to be a perfect match for what that +; document describes. + 1ffc: 03000000